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Embedded periodically ABHs and distributed DVAs for passive low-frequency broadband vibration attenuation in
Xiu-Xian Jia1, Ye Yu2, Yu Du3
1Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, Xihua University, Chengdu, 610039, China.
Scientific Reports
|August 9, 2024
Summary
This study enhances low-frequency vibration suppression in acoustic black hole (ABH) structures by integrating dynamic vibration absorbers (DVAs). Optimized DVA placement significantly improves broadband vibration attenuation, especially at lower frequencies.
Area of Science:
- Mechanical Engineering
- Structural Dynamics
- Acoustics
Background:
- Acoustic black hole (ABH) structures effectively focus energy above a cut-on frequency for vibration suppression.
- ABH structures show reduced performance in energy focusing below the cut-on frequency, necessitating low-frequency enhancement.
- Thin-walled structures require improved vibration attenuation methods, particularly in the low-frequency spectrum.
Purpose of the Study:
- To numerically investigate the integration of distributed dynamic vibration absorbers (DVAs) with ABH structures in thin-walled systems.
- To enhance low-frequency broadband vibration reduction capabilities of ABH structures.
- To analyze the impact of DVA design parameters and attachment positions on vibration attenuation.
Main Methods:
- Numerical analysis of ABH thin-walled structures to identify optimal DVA attachment points based on focusing characteristics.
- Simulation of distributed dynamic vibration absorbers (DVAs) integrated with ABH structures.
- Exploration of DVA design parameters and their influence on broadband damping effects.
Main Results:
- DVAs designed for low frequencies, when placed at specific ABH focusing positions, achieve significant vibration attenuation across the entire spectrum.
- Integration of DVAs provides superior broadband vibration attenuation compared to solely relying on ABH structures, even at low frequencies.
- Optimized DVA placement yields greater overall vibration attenuation across the frequency band, despite a slight reduction in low-frequency amplitude attenuation compared to maximum response points.
Conclusions:
- Distributed dynamic vibration absorbers (DVAs) are effective in enhancing the low-frequency vibration attenuation of acoustic black hole (ABH) structures.
- Strategic placement of DVAs at ABH focusing points is crucial for achieving broadband vibration suppression in thin-walled structures.
- This research provides a pathway for optimizing the combined use of ABHs and DVAs for advanced vibration control solutions.
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